Java ManagementFactory獲取運行時資訊

Java ManagementFactory獲取運行時資訊

一.獲取作業系統資訊

public class o {
	 public static void main(String[] args) throws Exception {
		 OperatingSystemMXBean system = ManagementFactory.getOperatingSystemMXBean();
		 System.out.println("系統的架構:"+system.getArch());
		 System.out.println("cpu內核數:"+system.getAvailableProcessors());    
		 System.out.println("系統名稱:"+system.getName());
		 System.out.println("系統版本:"+system.getVersion());
		 System.out.println("系統負載平均值:"+system.getSystemLoadAverage());
	 }
		 	
}
系統的架構:amd64
cpu內核數:8
系統名稱:Windows 10
系統版本:10.0
系統負載平均值:-1.0

二.獲取類加載資訊

public class o {
	 public static void main(String[] args) throws Exception {
		    ClassLoadingMXBean classLoad= ManagementFactory.getClassLoadingMXBean();
			System.out.println("已加載類總數："+classLoad.getTotalLoadedClassCount());
			System.out.println("已加載當前類："+classLoad.getLoadedClassCount());
			System.out.println("已卸載類總數："+classLoad.getUnloadedClassCount());
	 }
		 	
}
已加載類總數：443
已加載當前類：443
已卸載類總數：0

三.獲取jvm資訊

	 public static void main(String[] args) throws Exception {
		   RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
			System.out.println("行程PID="+runtime.getName());
			System.out.println("jvm規范名稱:"+runtime.getSpecName());
			System.out.println("jvm規范運營商:"+runtime.getSpecVendor());
			System.out.println("jvm規范版本:"+runtime.getSpecVersion());
			System.out.println("jvm啟動時間（毫秒）:"+runtime.getStartTime());
			System.out.println("jvm運行時間（毫秒）:"+runtime.getUptime());
			System.out.println("jvm名稱:"+runtime.getVmName());
			System.out.println("jvm運營商:"+runtime.getVmVendor());
			System.out.println("jvm實作版本:"+runtime.getVmVersion());
			List<String> a = runtime.getInputArguments();
			if(a != null && !a.isEmpty()){
				System.out.println("vm引數:");
				for(String t : a){
					System.out.println(t);
				}
			}
			System.out.println("類路徑:"+runtime.getClassPath());
			System.out.println("引導類路徑:"+runtime.getBootClassPath());
			System.out.println("庫路徑:"+runtime.getLibraryPath());
	 }
	 資訊太多你們自己執行看吧

四.獲取記憶體資訊

	 public static void main(String[] args) throws Exception {
		MemoryMXBean memory = ManagementFactory.getMemoryMXBean();
		MemoryUsage headMemory = memory.getHeapMemoryUsage();
		System.out.println("堆:");
		System.out.println("初始:"+headMemory.getInit());
		System.out.println("最大"+headMemory.getMax());
		System.out.println("已使用"+headMemory.getUsed());
		System.out.println("已申請:"+headMemory.getCommitted());
		System.out.println("使用率:"+headMemory.getUsed()*1.00/headMemory.getCommitted());
		
		System.out.println("非堆:");
		MemoryUsage nonheadMemory = memory.getNonHeapMemoryUsage();
		System.out.println("初始:"+nonheadMemory.getInit());
		System.out.println("最大"+nonheadMemory.getMax());
		System.out.println("已使用:"+nonheadMemory.getUsed());
		System.out.println("已申請:"+nonheadMemory.getCommitted());
		System.out.println("使用率:"+nonheadMemory.getUsed()*1.00/nonheadMemory.getCommitted());

	 }
//回傳的是位元組可以自己除以下
初始:266338304
最大3786407936
已使用2663416
已申請:255328256
使用率:0.01043134058770213
非堆:
初始:2555904
最大-1
已使用:4440184
已申請:8060928
使用率:0.5508278947535569

五.獲取執行緒資訊

			ThreadMXBean thread = ManagementFactory.getThreadMXBean();
			System.out.println("活動的執行緒總數="+thread.getThreadCount());
			System.out.println("峰值="+thread.getPeakThreadCount());
			System.out.println("創建并執行過的執行緒總數="+thread.getTotalStartedThreadCount());
			System.out.println("守護執行緒總數="+thread.getDaemonThreadCount());
			
			//查找死鎖執行緒id
			long[] deadlockedIds =  thread.findDeadlockedThreads();
			if(deadlockedIds != null && deadlockedIds.length > 0){
				ThreadInfo[] deadlockInfos = thread.getThreadInfo(deadlockedIds);
				System.out.println("死鎖執行緒");
				for(ThreadInfo deadlockInfo : deadlockInfos){
					System.out.println(deadlockInfo.getThreadName()+"\t"+deadlockInfo.getThreadState()
							+"\t"+deadlockInfo.getBlockedTime()+"\t"+deadlockInfo.getWaitedTime()
							+"\t"+deadlockInfo.getStackTrace().toString());
				}
			}
			//查找all執行緒id
			long[] threadIds = thread.getAllThreadIds();
			if(threadIds != null && threadIds.length > 0){
				ThreadInfo[] threadInfos = thread.getThreadInfo(threadIds);
				for(ThreadInfo threadInfo : threadInfos){
					System.out.println("all-名稱"+threadInfo.getThreadName()+"，狀態"+threadInfo.getThreadState()
							+"，id"+threadInfo.getThreadId());
				}
			}
活動的執行緒總數=5
峰值=5
創建并執行過的執行緒總數=5
守護執行緒總數=4
all-名稱Attach Listener，狀態RUNNABLE，id5
all-名稱Signal Dispatcher，狀態RUNNABLE，id4
all-名稱Finalizer，狀態WAITING，id3
all-名稱Reference Handler，狀態WAITING，id2
all-名稱main，狀態RUNNABLE，id1